Renewable Energy Laboratory Development for Biofuels Advanced Combustion Studies Page: 20 of 36
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DE-EE0003667 - Final Technical Report
The convection heat transfer coefficient is displayed in the following formula:
I A(a) = -1.2775 - 10-8 - TA(a) + 7.66696 - 10-5 - TA(a) + 0.0044488 (8)
DI and IDI Engine
The maximum convection and radiation fluxes for diesel and peanut FAME are practically the same for
low load and they start to show differences as loads increase Figures 36-37. The convection flux has a
maximum value earlier in the cycle compared to the radiation flux and following the zone of maximum
turbulence location, while the crank angle to which the maximum radiation flux was obtained is
maximally temperature dependent. For the IDI engine the values are practically identical and proving
again the high tolerance to various fuels of the IDI engine.
These results fit well with the studies of Soloiu [3] and Borman and Nishiwaki [11].2
1.5
w1
F 0.50
320340 360 380
Crank Angle [CAD]2
1.5
N.
400 420
Figure 36 Heat fluxes 1 bar imep Peanuts
FAME vs ULSD#2, DI engine
2
Total flux
ILSD
1.5 --- Ps --
a 1 '
Convection
flux
Radiation fux
0
300 320 340 360 380 400 420
Crank Angle [deg.]
Figure 38 Heat fluxes Peanuts FAME vs ULSD#2,
IDI engine, 6.2 bars iemp, 2200 rpmTotal Heat Flux
1
y --
0.5 "diConvection -
...
Radiation:0
320340 360 380
Crank Angle [CAD]400 420
Figure 37 Heat fluxes 3 bars imep Peanuts
FAME vs ULSD#2, DI engine
2
Total flux
ULSD
020
1.5 - 050
Convection
flux
0.5
Radiation
0
300 320 340 360 380 400 420
Crank Angle [deg.]
Figure 29 Heat fluxes Peanuts FAME vs
ULSD#2, IDI engine, 6.2 bars iemp, 2200rpmMarch 31, 2012
Total Heat Flux
Diesel
B100
Convection
Radiation tDiesel
LB10020
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Soloiu, Valentin. Renewable Energy Laboratory Development for Biofuels Advanced Combustion Studies, report, March 31, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc827653/m1/20/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.